Variation of Soil Nitrogen Components under different degradation condition in Napahai wetland reserve
There are 4 soil types of in Napahai wetland reserve,northwest Yunnan-Abandoned Farmland Mesophytic Meadow Soil（AFMMS）,Mesophytic Meadow Soil（MMS）,Wet Meadow Soil（WMS）,and Marsh Soil（MS）,correspondingly their degradation degrees from high to low.Contents of Total N（TN）,Rapid Available N（RAN）,Dissolved Organic N（DON） and Inorganic N（IN） at 3 layers（1st 0 ~ 10 cm,2nd 10 ~ 20 cm,3rd 20 ~ 30 cm） were analyzed for these 4 types of soils.Results showed that： ① From up to down in the soil profiles,contents of N components of AFMMS,MMS and WMS decreased gradually,but relatively concentrated in the 1st layer.The orders of the TN and RAN contents of MS were the 2nd layer the 1st layer the 3rd layer,which indicated relative enrichment in the 1st and 2nd layers;but the contents of DON and IN of MS decreased downwards and relatively enriched in the 1st layer.Both DON and IN accounted for very low percentages of RAN of the 4 types of soils.② Among 4 soils,the contents of N components in the 1st layer showed significant variation as AFMMS MMS WMS MS,but no obvious variation in the 2nd and 3rd layers（except the layers of MS）.The significant variation of N components in the 1st layers among 4 soils revealed the effects of human disturbances within the wetland region.③ The corresponding relationship between the variation of N components in the 1st layers and the soil moisture condition among 4 soils showed,wetland becoming dry would accelerate the loss of soil N components in the wetland.Regulating measures should be taken to control further wetland drying in future Napahai conservation and management.
NETL
NSTL
万方数据
维普
